The 2014 Honda Insight continues to be rated at 42 mpg combined (41 mpg city, 44 mpg highway). Any car at or above 40 mpg is among the most fuel-efficient sold in the U.S., but the competition is stiffer now than it was five years ago.
There are now four separate Toyota Prius models that match or beat that combined rating, and even Honda's own compact Civic Hybrid comes in at 44 mpg combined. And while the Ford C-Max has been reduced from a combined 47 mpg to 43 mpg, it is larger, more powerful, and better equipped (at a higher price) and still gets a higher rating.
The Honda Insight seems to do well in real-world mileage achieved by its drivers, however--notably unlike the C-Max in particular--so the effective difference in fuel consumption may be higher than the EPA ratings would achieve. But in the subcompact category especially, the Insight's price premium of several thousand dollars over conventional gasoline entries that are now as high as 33 or 34 mpg may make the numbers a hard sell.
So while the Insight hangs onto the laurels as the cheapest hybrid sold in the U.S., it faces a growing list of competitors--especially among the affluent hybrid buyers who are willing to pay about $5,000 more for a larger car that still gets better gas mileage.